Dry ash removal for gas producer



Oct. 23, 1951 F. VON GONZENBACH DRY ASH REMOVAL FOR GAS PRODUCER Filed May 10, 1946 INVENTOR. Fa'e vied/072 Gov z evac/z ATTORNEYS I Patented Oct. 23, 1951 DRY ASH REMOVAL FOR GAS PRODUCER Federico von Gonzenbach, Lucerne, Switzerland,

assignor to Vogogas, Ltd., Lucerne, Switzerland, a joint-stock company Application May 10, 1946, Serial No. 668,671

1 Claim.

This invention relates to a dry ash removal apparatus for gas producers having rotating grates.

In nearly all designs of ash removal for gas producers having rotating grates, water is used for the sealing of the ash pan against gas exit, which incidentally has also the advantage of preventing dust.

The use of water as a gas seal in the ash pan and over the rotating grate has however the disadvantage of increasing the power required for moving the ashes over the grate on one hand, and on the other hand, the inertia of the heavy wet ashes might well, in the case of a gas producer with excentrically located tuyeres cause fluctuations in gas output and quality, since, instead of sinking gradually and uniformally, the ashes tend to fill mostly the deep furrows formed in the wet ash masses over the rotary grate, especially when the grate is rotating at high speed. The sinking of the ashes in these furrows tends to disturb the fire bed and the fuel layers.

With axially located tuyre, another disturbance takes place. Due to the action of the ash plow transferring the ashes from the ash pan to the ash disposal system, whereby the heavy wet ashes must be shifted over the edge of the pan, the wet ashes build themselves up over an area of the grate, affecting about one third of the circumference. This action makes itself felt in an upward reaction towards the inner side of the gas producer and results in greater compactness of the ashes and fuel layers over certain areas, this affects the uniformity of the air blast through the fuel layers, with corresponding fluctuations in gas output and quality.

Another disadvantage of this system of water seal is that Water vapors forming on the grate reach the fire bed; apart from the lowered efficiency due to the superheating of this water in the gas producer there is the subsequent burning of the hydrogen formed in the fire bed through dissociation, this also tends to lower the gas producers efliciency.

Until now there have been but few designs of dry-ash-removal, and these only for small plants.

Their drawbacks reside mostly in difiiculties' met with the emptying of the ash bags, when clouds of dust are released.

Moreover another great difliculty is met with in keeping the bags tight and preventing the escape of noxious gases.

In order to secure a reliable seal the bags were fitted with a double closing device; however, due to the unavoidable settling of ash particles between the joints, these devices cannot be made secure against the escape of noxious gases.

An object of this invention therefore is to provide means, for insuring the removal of ashes from the gas producer shell without undue perturbations to the fuel layers or the fire bed, and to dispose the water seal in an ash chute under the grate, where water vapor does not form.

With the above and other objects in view the invention consists of the novel details of construction, arrangement and combination of parts" more fully hereinafter described, claimed and illustrated in the accompanying drawing in which:

Figure 1 is a vertical longitudinal section an embodiment of the invention, and

Figure 2 is a detailed fragmentary enlarged sectional view of the lower periphery of the ring and its associated structure.

Referring more in detail to the drawing the reference numeral I designates the shell of the gas producer, which is adapted to be seated on the ring 2 disposed thereunder in axial relation therewith.

The ring 2 is provided with a plurality, of relatively spaced openings 26 which form a plurality of projections 3 against which large clinkers are crushed by the wings 5 of the rotary grate 6. An annular space 4 is provided between the grate 6 and the ring 2 the purpose of which will be later explained.

Between the lower periphery of the ring 2 and the outer periphery of the grate 6 is provided an annular space 1 through which ashes will flow to be collected by the annular trough ll) positioned at the periphery of the grate 6. The grate 6 at its periphery has an upstanding flange 8 and projections 9 which are vertically arranged within the trough to shift the ashes along the trough until they are discharged through the chute H.

Communicating with the chute H is an ash disposal conveyor r2 which removes the ashes for disposal to a bin l3. The lower end of the chute II is positioned under water which forms a seal 25 against the escape of gases from the chute and conveyor.

The grate 6 is provided with a cone shaped projection l5 having a conical head M which directs the fall and flow of ashes in the direction of the annular space 4 previously referred to.

Between the trough l0 and the rotary grate 6 an annular water seal I6 is provided and this seal prevents the escape of gases in like manner as does the seal 25 previously mentioned.

The grate 6 is mounted for rotation on the bearings I! in the usual manner.

, 3' Covering the space between the trough I0 and the base of the shell I is an annular cover plate 20 which supports the trough since it is secured to the base of the shell and the upper periphery of the trough.

Provided in the cover plate 20 is a tamper l8 having a blade l9 which can be set to protrude into the ashes,withinzthei-annular space 4: teas-- sist in removing. or: breaking clinkers or; to. assist,

in discharging the ashes into the trough as the wings 5 of the grate 6 gradually tend to move the;

ashes toward the periphery of. thegrate.

It is believed that the operation and description of the apparatus will be apparent to those skilled: in the art and it is also tobe-understoodthat; changes in the details of construction, arrange! ment and combination of parts may be resorted to provided they fall within the spirit of'the invention and the scope of the appendedszclaimz Having thus described; the invention what is claimedas new. anddesiredto be secured by Letters Patentis :v

AA'IGViCB. of, the character describedfor, ash removalfiomrotating grates of gas producers having,an,annular shell, comprising anannular ring securedfto thelower periphery: of the shell, an

annular, cover plate secured tothe ring, below its connection, to the shell, anv annularv trough disposledLconcentrically to. the grate and secured to the lower periphery, of the cover plate, vertically disposemwingspn the grate, for engaging the: ashes-l to, movethe, ashes. from the grate into theztrou hnaplurality oflprojections on the innet. surface of, thering adapted to coact with said wings to crus'hplinkersinsaid ashes, avertically disposed chute carried by said trough, a water seal for the lower end of the chute, an upstanding flange on the periphery of said grate, projections on said flange for moving the ashes from the trough to the upper end of said chute, means at the lower end of said chute for removing the ashes from the lower end of said chute, a tamper mounted onisaid ring, abl'ade: on said-tamper extending into said trough" to assist in breaking up the clinkers and removing the ashes from the trough, and a second water seal between the grateand the trough to prevent the escape of gases from said gas producer.

FEDERICO VON GONZENBACH.

REFERENCES CITED The: following; references are of record in the file of this. patent:

UNITED STATES PATENTS Number Name Date 1,514.1,246; Sargent Jan. 9, 1923 1,680,183: Szika et a1. Aug. 7, 1928 Lil-19,519- Pulver July 2, 1929-- 1i,876,801 Van Ackeren Sept, 13., 1932. 1;,928;6 08v Van'Ackeren ,Sept. 26, 1933- 1,931,417 Schultz Oct.- 17; 1933 1,986,109 Jowett Jan. 1, 1935 2,163,148 Linden June 20, 1939 2,171,538- Black etal. Sept.-.l5, 193.9 2,252,802,, Daniels: .Aug, 19, 1941 I FOREIGN PATENTS Number Country Date 400,150, Germany Aug, 13, 1924 

